A Coupled SPH-Spectral Method for the Simulation of Wave Train Impacts on a FPSO

2014 ◽  
Author(s):  
G. Oger ◽  
D. Le Touzé ◽  
G. Ducrozet ◽  
J. Candelier ◽  
P.-M. Guilcher
Keyword(s):  
Spectral Method ◽  
Complex Geometry ◽  
Wave Train ◽  
Floating Body ◽  
Dynamic Impact ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
High Dynamic ◽  
Complementary Techniques ◽  
Correct Design

In order to help in achieving a correct design of structures subjected to wave impacts, CFD tools with a sufficient accuracy should be developed. But nowadays, modelling accurately both wave propagations and the resulting impact of a wave train on a complex geometry is still challenging. This paper deals with the introduction of a weak coupling between a Spectral method and Smoothed Particle Hydrodynamics (SPH), used as complementary techniques for modelling respectively wave propagation and high-dynamic impact of a wave train on a complex-shaped floating body. Comparisons with experiments are provided as a validation of these preliminary developments.

SIMULATION OF COMPRESSIBLE AND INCOMPRESSIBLE FLOWS BY MESHLESS METHODS OF SMOOTHED PARTICLE HYDRODYNAMICS

2020 ◽  
Author(s):  
S. M. FROLOV ◽  
◽  
V. S. IVANOV ◽  
Vas. S. IVANOV ◽  
R. R. TUKHVATULLINA ◽  
...  
Keyword(s):  
Steady State ◽  
Smoothed Particle Hydrodynamics ◽  
Compressible Flows ◽  
Incompressible Flows ◽  
Complex Geometry ◽  
Numerical Algorithms ◽  
Engine Oil ◽  
Piston Engine ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

At present, when solving problems of hydrodynamics of viscous incompressible and compressible flows in conditions of complex geometry with moving elements, preference is often given to meshless numerical algorithms based on the Smoothed Particle Hydrodynamics (SPH). We have developed our own parallel SPH algorithm that uses graphic processors to solve various problems with very narrow slits, rotating and contacting disks, free surfaces, etc., which are difficult to attack by conventional mesh-based (e. g., finite volume (FV)) methods. To check the algorithm, we solved the problems: (i) on the steady-state temperature distribution inside the cylinder head of a piston engine; (ii) on the torque of a gear box with rotating gearwheels partially immersed in engine oil; and (iii) on the steady-state gas velocity field during purging of the piston engine cylinder with air.

Multi-Physics SPH Simulations of Launching Problems and Floating Body Interactions

2012 ◽  
Author(s):  
Christian Ulrich ◽  
Thomas Rung
Keyword(s):  
Particle Methods ◽  
Floating Body ◽  
Sph Method ◽  
Variable Resolution ◽  
Floating Structures ◽  
Structural Details ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Suspension Model ◽  
Efficient Parallelization

The paper reports on the predictive prospects of the Smoothed-Particle-Hydrodynamics (SPH) method for jacket launching and foundation installation simulations. The type of considered applications usually involves the interaction between floating structures (e.g. barges and jackets) as well as structures and seabeds. Such scenarios pose challenges to mesh-based solvers, particle methods like SPH therefore are of advantage. The presented procedure captures floating body motions using a quaternion based 6DOF motion solver. Fluid/Soil interaction is predicted by an adequate suspension model. An efficient parallelization strategy is applied together with a dynamic variable resolution approach to handle large computational domains and structural details requiring a rather fine discretization.

scholarly journals SPH MODELLING OF TSUNAMI WAVE IMPACT ON LOW-RISE STRUCTURES

2020 ◽  
pp. 17
Author(s):  
Gede Pringgana ◽  
Lee S. Cunningham ◽  
Benedict D. Rogers
Keyword(s):  
Wave Train ◽  
Building Stock ◽  
Wave Impact ◽  
Focusing Effect ◽  
Baseline Case ◽  
Particle Hydrodynamics ◽  
Single Structure ◽  
Multiple Structures ◽  
Smoothed Particle ◽  
Structure Orientation

This study examines the influence of low-rise structure orientations on tsunami-induced impact force. The particular focus is on low-rise structures since these often make up the majority of building stock in tsunami prone areas and are usually most vulnerable. The meshless method smoothed particle hydrodynamics (SPH) is used for simulating the tsunami flow. Multiple cube structures named A, B and C were arranged at different angles of rotation and were situated on a flat shore. Four cases were simulated with variation on the number of structures and orientation toward the tsunami direction. Case 1 comprises a single structure (SS) C without rotation (R=0 degrees) and used as the baseline, Case 2 contains multiple structures (MS) A, B and C without rotation (R=0 degrees), Case 3 includes multiple structures (MS) A, B and C with 30 degree rotation (R=30d egrees), and Case 4 consist of multiple structures (MS) A, B and C with 45 degree rotation (R=45 degrees). The simulations show that for a 2-solitary wave train the front structures generated a flow focusing effect that accelerated the bore velocity. The orientation of the multiple structures to the direction of the oncoming tsunami bore significantly affected the magnitude of the applied force, where the most effective structure orientation is provided by the 45-degree rotation. The results of this study emphasize the potential for improving tsunami resilience through appropriate positioning of structures. Importantly, such large reductions in force may provide an economic solution to building resilience in developing countries prone to tsunamis.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/WNtyTNzQ7yY

Smoothed Particle Hydrodynamics: Benchmarking on Selected Test Cases Within the NextMuSE Initiative

2013 ◽  
Author(s):  
David le Touzé ◽  
Daniel A. Barcarolo ◽  
Matthieu Kerhuel ◽  
Guillaume Oger ◽  
Nicolas Grenier ◽  
...  
Keyword(s):  
Work Load ◽  
Floating Body ◽  
Test Cases ◽  
Sph Method ◽  
Incompressible Sph ◽  
Jet Impact ◽  
Flow Past A Cylinder ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Near Future

In this paper are presented comparisons of SPH variants on academic test cases classically used to validate numerical fluid dynamics software. These comparisons are extracted from NextMuSE FP7 project activities which will be published more extensively in the near future. One of the goals of this project was to better understand the SPH method and to leave the path to its establishment within CFD methods. An important work load was thus dedicated to benchmark SPH variants on selected test cases. A number of results and conclusions of this comparative study are presented in this paper. The studied variants are: standard weekly-compressible SPH, δ-SPH, Riemann-SPH, incompressible SPH, and FVPM. The majority of the test cases also present a reference solution, either experimental or computed using a mesh-based solver. Test cases include: wave propagation, flow past a cylinder, jet impact, floating body, bubble rise, dam break on obstacle, floating body dynamics, etc. Conclusions may help SPH practitioners to choose one variant or another and shall give detailed understanding necessary to derive further improvements of the method.

scholarly journals 3-D Numerical Study of a Bottom Ramp Fish Passage Using Smoothed Particle Hydrodynamics

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1595
Author(s):  
Gorazd Novak ◽  
José M. Domínguez ◽  
Angelo Tafuni ◽  
Ana T. Silva ◽  
Polona Pengal ◽  
...  
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Complex Geometry ◽  
Numerical Study ◽  
Free Surface Flow ◽  
Fish Passage ◽  
Surface Flow ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Bed Roughness ◽  
The Impact

Worldwide, the overwhelming number of man-made barriers in fluvial systems has been identified as one of the major causes of the reported staggering average declines of migratory fish. Fish passages have been shown to help mitigate such problems. Close-to-nature types of fish passages, such as bottom ramps, bypass channels, and fish ramps can be used to minimize the impact of artificial steep drops (e.g., weirs) on the migration of aquatic fauna, especially in cases of low-head barriers. This study focuses on the characterization of the flow pattern in a bottom ramp. A 3-D numerical model based on the meshless smoothed particle hydrodynamics (SPH) method was successfully validated and then employed for the simulation of turbulent free-surface flow in a straight channel with complex geometry. The effects of bed roughness, channel slope, and flow rate were quantified in terms of flow depth, velocity fields, and area‒velocity ratios. During the study, several new tools were developed, leading to new functionalities in pre-processing, solver, and post-processing which increase the applicability of DualSPHysics in the field of eco-hydraulics.

Simulation de l'écoulement au cours du procédé de rotomoulage par la méthode Smoothed Particle Hydrodynamics (SPH)

2008 ◽  
Vol 96 (6) ◽  
pp. 263-268 ◽  
Author(s):  
E. Mounif ◽  
V. Bellenger ◽  
A. Ammar ◽  
R. Ata ◽  
P. Mazabraud ◽  
...  
Keyword(s):  
Smoothed Particle Hydrodynamics ◽  
Particle Hydrodynamics ◽  
Smoothed Particle
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